I picked up a Liz Lange at Target swimsuit that was cute (but never got used, since DD was born early before the pool opened... Same will happen this go-round)

But I recommend Land's End suits. I have some mix/match pieces so I can make 2 piece suits. The have tops that can either be really long or cinched up on the sides to be shorter that would work well for a regular plus size suit or a maternity one, I believe. (For me, anyway!) Get more bang for your buck that way. I'll poke around and see if I can find one like I"m talking about for illustrative purposes...

I own a couple old navy suits, a few Liz Lange and one from motherhood. Motherhood runs small. I have a one piece from Liz Lange that I love and then a few tankini style tops as well, but they don't seem to support me well. Same with old navy, the support is awful. But can't be too picky I suppose when searching for plus size and maternity. Those are probably the easiest three places to get your hands on a suit, but I would love to hear if there is another place to find a great one!